A smaller form factor for power adapters for laptops is always in high demand. Not only does it allow for more power-efficiency, the sheer reduction of size is an advantage as far as mobility is concerned--and these days mobility seems to be driving everything.

An affordable small laptop power adapter will be a great benefit to traveling workers. The system must also be more power efficient than my current laptop "brick" - the heat generated by my computer brick would melt a small sealed converter like the one shown in the image. I suspect it also comes with an unexpected benefit - by rigidly connecting to the power outlet, air circulation is ensured in a manner that a brick on a rug or buried under papers is not.

I visited the FINsix website to learn more about their VHF switching technology, but could not get the information I was looking for. At 100Mhz or more switching frequency, other than the switching loss there would be increased challenges for making it compliance to EMI standards. It would be interesting to learn how they have overcome those challenges.

In thinking about this I think the following. The reduction of current/size of the inductors (big, heavy and hot) plus the losses in the recovery diode, as well as the switcher are heavily impacted by the frequency and current per cycle. At these frequencies the currents are very small per cycle dropping the IR losses considerably. The inductors get to be so small, and if the waveform is dynamically shaped (remember this is an RF signal, peaked or tuned) closer to a high Q filter then the representative signal looks more like a square wave, then the IR losses drop considerably again. I'm intrigued... Vannin

I will be interested to learn more details about this tiny 65W charger. The switching loss vs. Rds(on) calculation typically favors much lower switching frequencies than this -- usually a few MHz at best. I am curious how they pulled this off.

It seems to me that switching losses can be minimized with zero voltage switching but there is still that challenge on passives that need to be resolved. I hope compact adpaters like these succeed in market.

FINsix will begin production of its innovative 65W adapter in mid-2014. One can preorder the adaptor. But as you said this piece of hardware will be costlier compared to the regular adaptors available in the market due to higher switching rate electronics, but electronics has never remain costly for longer period just wait for some time it will surely be available at the regular adaptors cost. The time to market of this small adaptor is also very large, may be someone will put a better device before it comes in competition.